Structural durability design optimisation and its reliability assessment

Byeng D. Youn, Kyung K. Choi and Jun Tang

International Journal of Product Development, 2005, vol. 1, issue 3/4, 383-401

Abstract: Mechanical fatigue subject to external and inertia transient loads in the service life of mechanical systems often leads to structural failure due to accumulated damage. A structural durability analysis that predicts the fatigue life of mechanical components subject to dynamic stresses and strains is a computer-intensive, multidisciplinary simulation process, since it requires the integration of several computer-aided engineering tools and large amounts of data communication and computation. Uncertainties in geometric dimensions result in the indeterministic fatigue life of a mechanical component. Uncertainty propagation to structural fatigue under transient dynamic loading is not only numerically complicated but also extremely expensive. It is, therefore, a challenge to develop a durability-based design-optimisation process and reliability analysis to ascertain whether the optimal design is reliable. The objective of this paper is to develop an integrated CAD-based computer-aided engineering process to effectively carry out design optimisation for structural durability, yielding a manufacturable, durable, and cost-effective product. In addition, a reliability analysis is executed to assess the reliability of the deterministic optimal design.

Keywords: sizing and shape design; design optimisation; structural durability; fatigue life; multibody dynamics; reliability analysis; design sensitivity analysis; mechanical fatigue; dynamic loading; simulation; CAD; CAE. (search for similar items in EconPapers)
Date: 2005
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